If you walk through a large office, it's not uncommon to see one or more people sitting on stability balls instead of office chairs. Also called yoga or exercise balls, these large balls come in a variety of sizes and colors and aren't just designed for use at the gym. By trading your office chair for a stability ball, you'll experience such benefits as stronger abdominal muscles and better posture.

Select a stability ball that is the correct size for your height. If you try to sit on a ball that is too large or too small, your posture will not be correct. The American Council on Exercise outlines the ideal size ball for each height range. Those less than 4 feet 6 inches tall should choose a 12-inch diameter ball, those between 4 feet 6 inches and 5 feet should select an 18-inch ball, and those between 5 feet 1 inch and 5 feet 7 inches need a 22-inch ball. If you're between 5 feet 8 inches and 6 feet 2 inches, select a 26-inch ball and if you're taller than 6 feet 2 inches opt for a 30-inch ball.

Remove the chair from behind your desk and replace it with the ball. Position the ball roughly in the space that the chair occupied. When seated, you need to be able to comfortably reach your keyboard and mouse.

Sit on the ball so your feet are flat on the floor and your thighs are parallel to the ground. Position your upper body so your back is straight, which requires a slight contraction of your abdominal muscles. The angle between your back and thighs should be 90 degrees. If necessary, move the ball closer to your desk so you can access it without leaning forward.

Tip

Sitting on a stability ball requires a period of adjustment. Avoid the temptation to slouch, lift your shoulders or lean your head forward.

Moving away from your desk and doing a few minutes of bouncing on the ball can help break up the monotony of your day.

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About the Author

Toronto-based journalist William McCoy has been writing since 1997, specializing in topics such as sports, nutrition and health. He serves as the Studio's sports and recreation section expert. McCoy is a journalism graduate of Ryerson University.